Author Question: Americans combined drive about 4.0109 miles per day and their vehicles get an average of 20 miles ... (Read 34 times)

trevg · **on:** Nov 5, 2023

Question 1

Iron has a density of 7.87 g/cm³. What mass of iron would be required to cover a football playing surface of 120 yds × 60 yds to a depth of 1.0 mm? (1 inch = 2.54 cm; 1 lb = 453.6 g)

◦ 6.4 × 10³ lb
◦ 6.4 × 10⁴ lb
◦ 1.0 × 10⁵ lb
◦ 4.7 × 10⁷ lb
◦ 4.7 × 10⁸ lb

Question 2

Americans combined drive about 4.0×10⁹ miles per day and their vehicles get an average of 20 miles per gallon of fuel used. For each 1 kg of gasoline that is burned, about 3.0 kg of CO₂ are produced. How many kilograms of CO₂ are emitted into the atmosphere each day by cars in the U.S.? One gallon of gas weighs about 3.5 kg.

◦ 2.1 × 10⁹ kg
◦ 8.4 × 10¹¹ kg
◦ 1.7 × 10⁸ kg
◦ 93 kg
◦ none of these

hvhf4k+549qz8f218jyo@shar · **Reply #1 on:** Nov 5, 2023

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